On the R1 Michelin Defenders were more efficient when I changed the OEM Pirellis to them after they wore out at about 30k miles. Far better tread life as well.
This is my plan. I'll run the OEM probably until they are ready to replace and then switch to Defenders.
They do- a little. The weights are on the RivianTrackr Tire Guide
That $1K you save will pay for 2/3 of the next 21” AS tires you get (30K miles in the future). And you don’t have to ride on sloppy/noisy AT tires on asphalt.
Since I am getting 20s I hope this is valid! That said it might something as simple as owners with 21s do more highway driving as part the their usage. But that too is suspicious since nearly the same number of cars but with far fewer accumulated miles on the 21s. Way too many unknown variables to make a claim inclusive determination.Had this entire discussion on twitter too - the 20" ATs continue to keep a noticeable gap on the 21s:
At this point, IMHO, there is enough mileage and cars to reduce the impact of variation from location, speed, etc. I don't see the 21s getting to the delta they should have over the 20s (they should be 7% more efficient, not 5% less like it's showing now). Perhaps there is something wrong with that first batch of 21s Rivian got (e.g. wrong compound)?
-Rich
If we were only looking at a handful of cars and a few thousand miles total, I'd agree, but eventually everything reverts to the mean, and the mileage is quite high now. Unfortunately, it is difficult for RivianRoamer (which if you don't have, HIGHLY recommend - it's amazing) to show an average speed for all those cars combined, but if I had to venture a guess, we're already within a few mph for both tires (and I'd guess somewhere around 35mph avg). Plus there has been some argument around break-in for the tires, but this is a unique situation where ALL the tires were brand new, so they are all suffering the break-in period. It's not like we're comparing a brand new tire to tires that have been around for years and have the benefit of more wear, etc.
yeah I disagree, 16k miles across 30 cars is only 550 miles average per car. That’s not nearly enough to make any stat meaningful yet.
Is there a data scientist on this thread who can opine on statistical significance? I like the look of the 21s, but I would get the 20s if the range was even a bit better. Does anybody know which wheel weighs more?
and over 2000 miles of those figures are from Jose‘s car and the testing that OOS did with it..
There's not much that can be said. Too many potential confounders. The data certainly suggests there might not be a big difference in range between the two, but we can't make any conclusions.
Interestingly, both OEM tires are about 36 lb, while the complete 21” assembly is about 62 lb vs. 64 lb for the 20”. That puts the wheels themselves at roughly 26 lb for the 21” and 28 lb for the 20”.
Except a large chunk was back to Florida on his 20s. So outside of the testing they did, it's probably close to a wash. And there have been plenty of others on 20s doing the same 70mph testing (and also launching, etc). This is my point. If it were only a handful of cars, sure. But it's getting broad enough that both have similar drivers, areas, etc. It's all washing out.
